Unexpected events occur in 1885 on Cobblestone Island for the nine Children of the Light. In dense fog, characters leave the island. Lucinda DePere departs for another country. Three beloved characters bid farewell while the rightful owners of Cottage Parakaleó return to the island. The pirates reappear, but one is up to no good. The boys discover a hidden treasure in their hideaway cave. In the General Store, a curious upper room is unlocked. Fireworks light up the island, objects continue to disappear, and children get locked in a cellar. One mystery is solved with startling results. Thomas and his Nektosha friend, Warm Autumn Breeze, hold a secret they dare not share until the time is right. Throughout the adventures, Thomas is reminded that self-control is a Fruit of the Spirit that blesses not only him but all "Children of the Light."